I bow to your wisdom … Not
When you workdogs for a living and have titled dogs in competative sport I will listen to you .
i HAVE worked dogs, and placed first in MANY obedience competitions, and what anagallis_arvensis says is correct and complete sense.
The Domestication of pit bull terriers, The Japanese Tosa, The Dogo Argentino and The Fila Brazileiro, was banned because of Ellie Lawrenson being mauled to death.
An absolute tragedy I agree, and the putting down of the dog and prosecution of the owners was the correct thing to do; but the killers of Jamie Bulger got 8 years and new lives to start again. Owning children wasn't banned, and the parents weren't prosecuted, far from it, they were moved to new homes with new identities.
Border Collies are the 2nd most rescued breed (2nd to Greyhounds) often because of their boredom levels, coming out in snapping and attacking people/animals.
Dogs (like kids) are born a blank sheet, it's what we do with them afterwards is what makes them what they are.